JP2001013317A - Filter for image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost filter for an image display device that the color reproducibility and contrast of an image can be improved only by laminating the filter on an image display device such as a PDP or on its front plate, and harmful electromagnetic waves and IR rays emitted from the device a be cut off. SOLUTION: The filter for an image display device has a selective absorption filter layer containing a bye and a polymer binder at least one side of a transparent supporting body. If the selective absorption filter layer is formed only on one side, an antireflection layer is formed on the uppermost layer on the opposite side to the selective filter layer. Or, if the selective filter layers are formed on both faces, the antireflection layer is formed as the uppermost layer on one of the sides, while a cohesive layer is formed to the opposite side to the antireflection layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a filter for an image display device having a transparent support, a selective absorption filter layer, an antireflection layer on the surface, and an adhesive on the opposite surface.
In particular, the present invention relates to a CRT, a plasma display panel (PDP), an electroluminescent display (ELD), a cathode ray tube display (CRT), a fluorescent display tube,
The present invention relates to a filter attached to an image device or a front plate for improving color reproducibility, preventing reflection, blocking infrared rays, and blocking electromagnetic waves of an image display device using fluorescence such as a field emission display.

[0002]

2. Description of the Related Art Conventional plasma display panels (PDs)
P), a cathode ray tube display (CRT), a fluorescent display tube, and a field emission display (FED), etc., perform full-color display by using three primary color phosphors of red, blue, and green. However, it is very difficult to make the emission spectrum of these three primary colors by a phosphor ideal. Further, in a plasma display, in addition to these three primary colors, extra fluorescence from neon (wavelength of 500 to 62) is used.
(A range of 0 nm), and there is a problem that ideal color reproducibility cannot be obtained. In order to improve this, a filter that absorbs light of a specific wavelength is used.
Nos. 153904 and 61-188501,
-231988, 5-205564, 9-14
No. 5918, No. 9-306366, No. 10-2670
No. 4 is described in each gazette.

[0003] Further, these image display devices have a problem that the background is reflected and the contrast is reduced. To solve this problem, an antireflection film formed by vapor deposition or coating has been proposed. Although vapor deposition is excellent in terms of antireflection, coating has the advantages of easy production and low cost. Vapor deposition is a method that has long been used as an antireflection film for glasses and camera lenses. For example, vacuum deposition, sputtering, ion plating, CVD, or P
VD method and the like can be mentioned. Coating is a method of applying a coating solution containing fine particles and a binder to a support,
These are described in JP-A-59-49501, JP-A-59-50401, JP-A-60-59250 and JP-A-7-48527.

[0004] It is conceivable to incorporate an anti-reflection function into a filter that absorbs light of the above-mentioned specific wavelength. For example, JP-A-61-188501, JP-A-5-20564
No. 3, 9-145918, 9-306366,
Each publication of JP-A-10-26704 discloses an optical filter having an antireflection function incorporated therein. JP 6
1-188501, JP-A-5-205643, 9
In the optical filters described in JP-A-145918 and JP-A-9-306366, a dye or a pigment is added to a transparent support so that the support functions as a filter. In the optical filter described in JP-A-10-26704, a hard coat layer (surface hardened layer) provided between a transparent support and an antireflection layer is colored, and the hard coat layer functions as a filter.

[0005]

If the transparent support or the hard coat layer of the antireflection film is colored, the transparent support or the hard coat layer functions as a filter. However, the types of dyes and pigments that can be added to the transparent support and the hard coat layer are very limited. The transparent support is made from plastic or glass (usually plastic). Dyes and pigments added to the transparent support are required to have heat resistance that can withstand the temperature during the production of the support. Dyes or pigments used for improving color reproducibility are required to have various absorption spectrum characteristics depending on the type of the image display device. It is difficult to improve reproducibility. The present inventors have tried to make a layer different from a transparent support or a hard coat layer, which has many restrictions on the types of dyes and pigments that can be used, function as a selective absorption filter layer and perform appropriate color correction of an image display device. . An object of the present invention is to provide a filter which has an excellent effect of improving color reproducibility, has an anti-reflection layer, and can be easily incorporated into an image display device. An object of the present invention is to provide a filter having a shielding function and an electromagnetic wave shielding function.

[0006]

The object of the present invention has been attained by the following inventions. (1) At least one side of the transparent support has a selective absorption filter layer containing a dye (pigment or dye) and a polymer binder, and when only one side has a selective filter layer, the uppermost layer opposite to the selective filter layer An image display device characterized in that, when a selective filter layer is provided on both sides, an antireflection layer is provided on the uppermost layer on one side, and an adhesive layer is provided on the side opposite to the antireflection layer. Filter. (2) The filter for an image display device according to (1), wherein the selective absorption filter layer is provided on the side provided with the pressure-sensitive adhesive layer. (3) The image display device according to (1) or (2), further including a shielding filter layer having one or both of an infrared shielding function and an electromagnetic wave shielding function on at least one side of the transparent support. filter. (4) The image according to any one of (1) to (3), further including a shielding filter layer having one or both of an infrared shielding function and an electromagnetic wave shielding function on the side where the antireflection layer is provided. Filter for display device. (5) The selective absorption filter layer has a wavelength of 560 nm to 62 nm.
The image display device filter according to any one of (1) to (4), wherein the filter has an absorption maximum having a transmittance of 0.01 to 80% in a range of 0 nm. (6) The selective absorption filter layer has a thickness of 500 nm to 55 nm.
A maximum absorption having a transmittance of 20 to 85% in a range of 0 nm and a transmittance of 0.0 in a range of 560 nm to 620 nm.
(1) characterized by having an absorption maximum of 1 to 80%
The filter for an image display device according to any one of (1) to (5). (7) A front plate for a plasma display panel, wherein the filter according to any one of (1) to (6) is used. (8) A plasma display panel using the front plate according to (7).

The present inventor has proposed a transparent support having a selective absorption filter layer for improving the color reproducibility of an image display device, an anti-reflection layer on the outermost surface, and an adhesive layer on the opposite surface. We considered attaching it to the display device itself or to the front panel. As a result that the transparent support having the selective absorption filter layer can be bonded with an adhesive, various types of dyes can be used for the filter layer. For example, in the field of silver halide photography, various photographic dyes have been developed. The absorption spectral properties of photographic dyes have also been studied in detail. In addition, layers with various other functions can be laminated, and in addition to anti-reflection properties, filters for image display devices that have various functions such as near-infrared shielding properties, electromagnetic shielding properties, and scratch resistance are possible. By attaching it to the image display device itself or the front panel, it becomes possible to improve the color reproducibility of the image and the visibility by reducing the surface reflection,
Further, it is possible to block unnecessary infrared rays, electromagnetic waves, and the like radiated from the display device, and to improve the performance such that the image surface is hardly damaged. In particular, the present invention has a structure in which an anti-reflection layer is disposed on the outermost surface on one side of the support, and an adhesive layer is disposed on the other side, and particularly, color reproducibility of an image and improvement in contrast have been achieved. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. (Plasma Display) In the invention, a plasma display panel (PDP) is composed of a gas, a glass substrate, an electrode, an electrode lead material, a thick film printing material, and a phosphor. There are two glass substrates, a front glass substrate and a rear glass substrate. An electrode and an insulating layer are formed on two glass substrates. A phosphor layer is further formed on the rear glass substrate. Two glass substrates are assembled, and gas is sealed between them. The front plate is a substrate located in front of the plasma display panel. The front plate preferably has sufficient strength to protect the plasma display panel. The front panel can be used with a gap from the plasma display panel, or can be used directly attached to the plasma display body.
The plasma display device according to the present invention is an entire display device including at least a plasma display panel main body and a housing. If it has a front panel, this is also included in the plasma display device. Plasma display panels (PDPs) are already commercially available. Regarding the plasma display panel, see
JP-A-205643 and JP-A-9-306366.

(Selective Absorption Filter Layer) The selective absorption filter layer of the present invention preferably has an absorption maximum between 560 nm and 620 nm, and its transmittance is 0.01% to 80% at the absorption maximum wavelength. Between
It is preferably between 0.01% and 60%, particularly preferably between 0.01 and 40%. Wavelength is 560nm ~
The absorption in the range of 620 nm is preferably sharp in order to selectively cut off the light so as not to affect the necessary emission region of the green phosphor as much as possible. Specifically, the half-width at the absorption maximum in the wavelength range of 560 nm to 620 nm is preferably 5 nm to 200 nm, more preferably 10 nm to 100 nm,
Most preferably, it is 10 nm to 50 nm.

The selective absorption filter layer has a wavelength of 560 nm or more.
500 nm to 550 n in addition to the absorption maximum at 620 nm
It is preferred that m has an absorption maximum. 500 nm-5
The transmittance in the range of 50 nm is 20% at the maximum absorption wavelength.
To 85%, preferably 40% to 85%.
Is more preferable, and most preferably 50% to 80%. Since the absorption maximum in the wavelength range of 500 nm to 550 nm is set to adjust the intensity by gently cutting the emission intensity of the green phosphor with high visibility, the wavelength is in the range of 500 nm to 550 nm. The half width at the absorption maximum (width of the wavelength region showing half the absorbance at the absorption maximum) is preferably 30 nm to 300 nm, more preferably 40 nm to 300 nm, and more preferably 50 nm to 150 nm. More preferably, it is most preferably from 60 nm to 150 nm.

(Dye: Pigment or Dye) In the present invention, a dye (pigment or dye) is used in the selective absorption filter layer in order to realize the above absorption spectrum. As the dye having an absorption maximum in the wavelength range of 500 nm to 550 nm, a squarylium-based, azomethine-based, cyanine-based, oxonol-based, anthraquinone-based, azo- or benzylidene-based compound is preferably used. Examples of azo dyes include GB 593,703 and 575,691.
Many azo dyes described in U.S. Pat. No. 2,956,879 and Hiroshi Horiguchi, "Reviews Synthetic Dyes", published by Sankyo Publishing Co., Ltd. can be used. Among them, azo dyes represented by the following general formula (a6) are preferred. Wavelength is 500nm ~ 550n
Examples of the dye having an absorption maximum in the range of m are shown below.

[0012]

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[0013]

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[0014]

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[0015]

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[0016]

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[0017]

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[0018]

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[0019]

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[0020]

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[0021]

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[0022]

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As the dye having an absorption maximum in the wavelength range of 560 nm to 620 nm, cyanine, squarylium, azomethine, xanthene, oxonol and azo compounds are preferably used. Wavelength is 56
Examples of the dye having an absorption maximum in the range of 0 nm to 620 nm are shown below.

[0024]

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[0025]

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[0026]

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[0027]

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[0028]

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[0029]

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[0030]

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[0031]

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[0032]

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[0033]

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[0034]

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In the selective absorption filter layer of the present invention, two or more kinds of dyes as described above can be used in combination. Further, the wavelength is 500 nm to 550 nm.
And a dye having an absorption maximum in both the range of 560 nm to 620 nm can be used in the selective absorption filter layer. For example, when the pigment is in an aggregated state such as a fine particle dispersion, the wavelength generally shifts to a longer wavelength side, and the peak becomes sharp. Therefore, if the wavelength is 500
Some dyes having an absorption maximum in the range of nm to 550 nm have an aggregate having an absorption maximum in the range of 560 nm to 620 nm. When used in a state where such a dye is partially formed into an aggregate, the wavelength is 500 nm to 550 n.
The absorption maximum can be obtained both in the range of m and in the range of 560 nm to 620 nm. Examples of such dyes are shown below.

[0036]

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[0037]

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The thickness of the selective absorption filter layer of the present invention is preferably 0.1 μm to 5 cm, and 0.5 μm to 5 μm.
More preferably, the thickness is from m to 100 μm.

(Polymer) The selective absorption filter layer of the present invention contains a polymer as a binder. Preferred specific examples thereof include natural polymers (eg, gelatin, acid-treated gelatin, lime-treated gelatin, low molecular weight gelatin,
Cellulose derivatives, alginic acid, pectin, carrageenan, locust bean gum) or synthetic polymers (eg,
Polymethyl methacrylate, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl chloride, styrene-butadiene copolymer, polystyrene, polycarbonate, and water-soluble polyamide). Among them, hydrophilic polymers (the above-mentioned natural polymers, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl alcohol, and water-soluble polyamide) and water-dispersed polymer latex (styrene butadiene rubber, polyvinylidene chloride) are particularly preferable.

(Transparent Support) Specific examples of preferred transparent supports that can be used in the present invention include cellulose esters (eg, diacetyl cellulose, triacetyl cellulose (TAC), propionyl cellulose, butyryl cellulose, acetyl propionyl). Cellulose, nitrocellulose), polyamide, polycarbonate, polyester (eg, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, poly-1,4-cyclohexane dimethylene terephthalate,
Polyethylene-1,2-diphenoxyethane-4,4 '
-Dicarboxylate, polybutylene terephthalate), polyarylate (eg, condensate of bisphenol A and phthalic acid), polystyrene (eg, syndiotactic polystyrene), polyolefin (eg, polyethylene,
Polypropylene, polymethylpentene), acrylic (polymethylmethacrylate), polysulfone, polyethersulfone, polyetherketone, polyetherimide and polyoxyethylene. Among them, triacetyl cellulose, polycarbonate, polymethyl methacrylate, polyethylene terephthalate and polyethylene naphthalate are particularly preferred. The thickness of the transparent support is preferably 5 μm or more and 5 cm or less, more preferably 25 μm or more and 1 cm or less, and most preferably 80 μm or more and 1.2 mm or less. The transmittance of the transparent support is preferably 80% or more, and more preferably 86% or more. The haze is preferably at most 2%, more preferably at most 1%. Refractive index is 1.45 to 1.70
It is preferable that

An infrared absorber or an ultraviolet absorber may be added to the transparent support. The amount of the infrared absorber added is preferably 0.01 to 20% by weight of the transparent support, more preferably 0.05 to 10% by weight. Further, as a slipping agent, particles of an inert inorganic compound may be added to the transparent support. Examples of inorganic compounds include S
_{iO 2, TiO 2, BaSO 4} , CaCO 3, talc and kaolin.

The transparent support is preferably subjected to a surface treatment in order to further enhance the adhesiveness with the undercoat layer. Examples of surface treatment include chemical treatment, mechanical treatment, corona discharge treatment, flame treatment, ultraviolet irradiation treatment, high frequency treatment, glow discharge treatment, active plasma treatment, laser treatment, mixed acid treatment,
Glow discharge treatment, ultraviolet irradiation treatment, corona discharge treatment and flame treatment are preferable, and corona discharge treatment is more preferable.

(Undercoat Layer) In the present invention, when the above-described selective absorption filter layer or another layer described later is provided on the support, an undercoat layer can be provided on the support. As the undercoat layer, a soft polymer having an elastic modulus at room temperature of 1,000 to 1 MPa, preferably 800 to 5 MPa, more preferably 500 to 10 MPa is preferable. The thickness is preferably 2 nm to 20 μm,
More preferably 5 nm to 5 μm, most preferably 5 nm
It is 0 nm to 1 μm. The polymer used in the undercoat layer preferably has a glass transition temperature of 60C or lower and -60C or higher. Examples of the polymer having a glass transition temperature of 60 ° C. or lower and −60 ° C. or higher include vinyl chloride, vinylidene chloride,
Examples thereof include those obtained by polymerization or copolymerization of vinyl acetate, butadiene, neoprene, styrene, chloroprene, acrylate, methacrylate, acrylonitrile or methyl vinyl ether. The undercoating can be provided in a plurality of layers, and is preferably provided in two layers.

(Anti-reflection layer) In the present invention, an anti-reflection layer having an anti-reflection function for visible light is provided. The reflectance of the antireflection layer is preferably 3.0% or less, more preferably 1.8% or less, as a regular reflectance. Usually, a low refractive index layer is provided as an antireflection layer. The refractive index of the low refractive index layer is lower than the refractive index of the lower layer. The low refractive index layer preferably has a refractive index of 1.2 to 1.55, and
More preferably, it is 0 to 1.50. The thickness of the low refractive index layer is preferably from 50 nm to 400 nm, and more preferably from 50 nm to 200 nm. Examples of the low refractive index layer include layers made of a fluoropolymer having a low refractive index (JP-A-57-34526, JP-A-3-130103, JP-A-6-115023, and JP-A-8-15023).
Nos. 13702, 7-168004).
Layer Obtained by Sol-Gel Method (Japanese Patent Application Laid-Open No. 5-2088811)
Nos. 6-299091 and 7-168003) or a layer containing fine particles (JP-B-60-5).
No. 9250, JP-A-5-13021 and JP-A-6-5647.
No. 8, No. 7-92306, and No. 9-288201). In the layer containing fine particles, voids can be formed in the low refractive index layer as microvoids between the fine particles or in the fine particles. The layer containing the fine particles preferably has a porosity of 3% to 50% by volume, and more preferably 5% to 35% by volume.

In order to prevent reflection in a wide wavelength range,
On the low refractive index layer on the high refractive index layer (medium / high refractive index),
It is preferable to stack layers having a high refractive index (medium / high refractive index layers). The refractive index of the high refractive index layer is preferably from 1.65 to 2.40, and more preferably from 1.70 to 2.20. The refractive index of the middle refractive index layer is adjusted to be an intermediate value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer. The refractive index of the middle refractive index layer is 1.50 to 1.90.
It is preferable that The thickness of the middle / high refractive index layer is 5n
m to 100 μm, preferably 10 nm to 10 μm.
μm, more preferably 30 nm to 1 μm. The haze of the middle / high refractive index layer is
It is preferably at most 5%, more preferably at most 3%, most preferably at most 1%.
The middle / high refractive index layer can be formed using a polymer having a relatively high refractive index. Examples of high refractive index polymers include polystyrene, styrene copolymers, polycarbonates, melamine resins, phenolic resins, epoxy resins, and polyurethanes obtained by reacting cyclic (alicyclic or aromatic) isocyanates with polyols. . Other polymers having a cyclic (aromatic, heterocyclic, alicyclic) group and polymers having a halogen atom other than fluorine as a substituent also have a high refractive index. A polymer may be formed by a polymerization reaction of a monomer capable of radical curing by introducing a double bond.

In order to obtain a higher refractive index, inorganic fine particles may be dispersed in a polymer binder. The refractive index of the inorganic fine particles is preferably from 1.80 to 2.80. The inorganic fine particles are preferably formed from a metal oxide or sulfide. Examples of metal oxides or sulfides include titanium dioxide (eg, rutile, rutile / anatase mixed crystal, anatase, amorphous structure), tin oxide, indium oxide, zinc oxide, zirconium oxide, and zinc sulfide. Titanium oxide, tin oxide and indium oxide are particularly preferred. The inorganic fine particles contain oxides or sulfides of these metals as main components and may further contain other elements. The main component means a component having the largest content (% by weight) of the components constituting the particles. Examples of other elements include Ti, Zr, Sn, Sb, Cu, Fe, Mn,
Pb, Cd, As, Cr, Hg, Zn, Al, Mg, S
i, P and S are included. Inorganic materials that are film-forming and can be dispersed in solvents or are themselves liquid, such as alkoxides of various elements, salts of organic acids, coordination compounds (eg, chelate compounds) combined with coordination compounds, activity The middle / high refractive index layer can be formed using an inorganic polymer.

(Adhesive Layer) Preferred examples of the adhesive used in the adhesive layer of the present invention include natural rubber, SB and the like.
R type (random copolymer of styrene butadiene, styrene-isoprene-styrene block polymer), butyl rubber type, recycled rubber type, acrylic type (polybutyl acrylate, polyethyl 2-ethylhexyl, polyacrylic acid), polyisobutylene , Silicone rubber, polyvinyl butyl ether and the like. Among them, acrylic is more preferable. As the pressure-sensitive adhesive, those described in Kaoru Kimura, Makoto Sunagawa et al., Edited by the Society of Polymer Science, "Highly functional adhesives / pressure-sensitive adhesives" can be used.
The pressure-sensitive adhesive layer is obtained by directly applying and drying a coating solution in which these pressure-sensitive adhesives are dissolved or dispersed in water or a solvent, on the opposite side of the antireflection layer of the transparent support of the present invention,
A pressure-sensitive adhesive layer may be provided by previously laminating an adhesive layer having good releasability on a support such as PET on the opposite side of the antireflection layer.

(Electromagnetic Wave Blocking Layer) The filter of the present invention may be provided with an electromagnetic wave shielding layer having an electromagnetic wave shielding function. The surface resistance of the electromagnetic wave shielding layer is 0.01 to 500
Ω / □, more preferably 0.01 to 10 Ω / □.
The electromagnetic wave shielding layer is preferably a transparent conductive layer so as not to lower the transmittance. As the transparent conductive layer, a metal layer,
Examples include a metal oxide layer and a conductive polymer layer. Examples of the metal forming the metal layer include silver, palladium, gold, platinum, rhodium, aluminum, iron, cobalt, nickel, copper, zinc, ruthenium, tin, tungsten, iridium, and lead alone or an alloy of two or more of these. Among them, silver, palladium, gold, platinum, rhodium alone or an alloy thereof is preferable. Among them, an alloy of silver and palladium is preferable, and the content of silver is preferably 60% by weight to 99% by weight.
More preferably, it is 80 to 98% by weight. The thickness of the metal layer is preferably 1 to 100 nm, more preferably 5 to 40 nm, and most preferably 10 to 30 nm. 1nm thick
If it is less than 100 nm, the electromagnetic wave shielding effect is poor, and if it exceeds 100 nm, the transmittance of visible light decreases. Examples of the metal oxide forming the metal oxide layer include tin oxide, indium oxide, antimony oxide, zinc oxide, ITO, and ATO. This film thickness is preferably from 20 to 1000 nm. More preferably, it is 40 to 100 nm.
It is also preferable to use a combination of the transparent conductive layer composed of the metal layer and the transparent conductive layer composed of the metal oxide layer. Also,
It is also preferable that a metal and a metal oxide coexist in the same layer. A transparent oxide layer can be laminated to protect the metal layer, prevent oxidative deterioration, and increase visible light transmittance. This transparent oxide layer may or may not be conductive. Examples of the transparent oxide layer include thin films of oxides of divalent to tetravalent metals, zirconium oxide, titanium oxide, magnesium oxide, silicon oxide, aluminum oxide, and metal alkoxide compounds. The method for forming the transparent conductive layer and the transparent oxide layer is not particularly limited, and any processing method can be selected. For example, any known technique such as sputtering, vacuum deposition, ion plating, plasma CVD or PVD, application of ultrafine particles of a corresponding metal or metal oxide, and adhesion of a metal sheet can be used.

In the present invention, it is preferable to provide a shielding filter layer having an infrared shielding function. 800 nm
Is the most problematic, and preferably has a shielding function for this region. To impart an infrared shielding function, a method of mixing a near-infrared absorbing compound with a transparent plastic support, a method of applying a solution or dispersion of these compounds, or the like can be used. For example, a resin composition containing a copper atom (Japanese Unexamined Patent Publication No.
-118228), a resin composition containing a copper compound and a phosphorus compound (Japanese Patent Application Laid-Open No. 62-5190), and a resin composition containing a copper compound and a thiourea derivative (Japanese Patent Application Laid-Open No.
-73197), and a resin composition containing a tungsten-based compound (US Pat. No. 3,647,729) can be easily produced. A method of forming a silver thin film on a transparent support is inexpensive and particularly preferable as a method of providing an infrared ray shielding function in addition to an electromagnetic wave shielding function.

(Other Layers) In the filter of the present invention, the surface has an anti-glare function (a function of scattering incident light on the surface to prevent a scene around the film from shifting to the film surface).
Can also be given. For example, an anti-glare function can be obtained by forming fine irregularities on the surface and forming an anti-reflection layer on the surface or forming the anti-reflection layer and then forming the irregularities on the surface with an embossing roll. . An antireflection layer having an antiglare function generally has a haze of 3 to 30%.

In the present invention, a hard coat layer, a lubricating layer, an antifouling layer, an antistatic layer or an intermediate layer may be provided. The hard coat layer preferably contains a cross-linked polymer. The hard coat layer can be formed using an acrylic, urethane, epoxy, or siloxane-based polymer, oligomer, or monomer (eg, an ultraviolet curable resin). A silica-based filler can be added to the hard coat layer. A lubrication layer may be formed on the outermost surface of the antireflection layer. The lubricating layer has a function of imparting lubricity to the surface of the antireflection layer and improving scratch resistance. The lubricating layer can be formed using polyorganosiloxane (eg, silicone oil), natural wax, petroleum wax, higher fatty acid metal salt, fluorine-based lubricant or a derivative thereof. The thickness of the lubricating layer is preferably from 2 to 20 nm. Alternatively, an antifouling layer can be provided on the outermost surface of the antireflection layer. The antifouling layer lowers the surface energy of the antireflection layer and makes it difficult to adhere to hydrophilic and lipophilic stains. Therefore, the antifouling layer is formed using a fluoropolymer. The thickness of the antifouling layer is 2 nm to 100 nm, preferably 5 nm to 30 nm.

Various layers in the present invention, that is, a selective absorption layer, an antireflection layer (low refractive index layer), a filter layer for shielding infrared rays and electromagnetic waves, an undercoat layer, a hard coat layer, a lubrication layer,
The antifouling layer and the like can be formed by a general coating method. Examples of application methods include dip coating, air knife coating, curtain coating, roller coating,
Wire bar coating, gravure coating, and extrusion coating using a hopper (US Pat.
681294). Two or more layers may be formed by simultaneous coating. Regarding the simultaneous coating method, U.S. Pat.
Nos. 3,508,947 and 3,526,528, and Yuji Harazaki, “Coating Engineering,” p. 253 (197)
3rd year Asakura Shoten). In addition, as a method for forming a layer in the present invention, a sputtering method, a vacuum evaporation method, an ion plating method, a plasma CVD method, or a PVD method can be appropriately selected.

The present invention relates to a liquid crystal display (LCD), a plasma display panel (PDP), an electroluminescence display (ELD) and a cathode ray tube display (C).
RT). A remarkable effect can be obtained by using the filter of the present invention for a plasma display panel (PDP) and its front panel.

Example 1 (Formation of an undercoat layer) After a corona treatment was applied to both sides of a transparent biaxially stretched polyethylene terephthalate film having a thickness of 175 μm, both sides had a refractive index of 1.55 and a glass transition temperature of 37 ° C.
(LX407C5, manufactured by Zeon Corporation) having a thickness of 300 nm after drying with a bar coater on the side on which the selective absorption filter layer is provided, and an antireflection layer on the opposite side. The side is applied so as to have a thickness of 160 nm, and dried at 140 ° C.
A first undercoat layer was formed. Further, an acrylic latex (HA16, manufactured by Nippon Acrylic Co., Ltd.) having a refractive index of 1.50 and a glass transition temperature of 50 ° C. is dried on the first undercoat layer on the side on which the antireflection layer is provided using a bar coater. Was applied to a thickness of 20 nm and dried at 140 ° C. to form a second undercoat layer. (Formation of selective absorption filter layer) Dye (b6) 0.06 was added to 180 g of a 7.4% by weight aqueous solution of low molecular weight gelatin.
6 g and 0.088 g of dye (a6) were added.
And then filtered with a 2 μm polypropylene filter. The obtained coating solution for a selective absorption filter layer was applied onto the first undercoat layer on the side of the selective absorption filter layer using a bar coater so that the dry film thickness was 1.9 μm. After drying for a minute, a selective absorption filter layer was formed.

(Formation of Antireflection Layer) Reactive Fluoropolymer (JN-7219, manufactured by Nippon Synthetic Rubber Co., Ltd.) 2.50
1.3 g of t-butanol was added to the resulting mixture, and the mixture was stirred at room temperature for 10 minutes and filtered with a 1 μm polypropylene filter. The obtained low anti-reflection layer coating solution was applied onto the second undercoat layer on the anti-reflection layer side using a bar coater to obtain a dry film thickness of 96.
nm, and dried and cured at 120 ° C. for 15 minutes to form an antireflection layer. (Formation of pressure-sensitive adhesive layer) The pressure-sensitive adhesive surface of a 38 μm-thick polyethylene terephthalate film coated with a weak acrylic pressure-sensitive adhesive was closely adhered to the antireflection layer, and then laminated with a 25 μm-thick acrylic pressure-sensitive adhesive. The adhesive surface of polyethylene terephthalate film of the same thickness
The filter of the present invention having an adhesive layer and having a protective film on the surface was prepared by adhering and laminating the filter on the selective absorption filter layer.

The filter of the present invention was adhered to a soda lime glass sheet with an adhesive, and the protective film was peeled off. The spectral transmittance was examined. As a result, the filter had absorption maximums at 540 nm and 593 nm, and the transmittance at the absorption maximum was 540 nm. Was 61% and the absorption maximum at 593 nm was 2.3%.
The half width of the absorption maximum is such that the absorption maximum at 593 nm is 25 nm.
Met.

Example 2 (Formation of Electromagnetic Wave and Infrared Shielding Layer) A three-layer thin film of ZnO / Ag / ZnO was provided on the surface of a transparent biaxially stretched polyethylene terephthalate film having a thickness of 175 μm by sputtering. The surface resistance of this three-layer thin film system was 5 Ω / square cm, and the transmittance of infrared light of 800 nm or more was 20% or less. (Formation of Undercoat Layer) After a corona treatment is applied to the back surface of the biaxially stretched polyethylene terephthalate film having the three-layer thin film, a latex made of a styrene-butadiene copolymer having a refractive index of 1.55 and a glass transition temperature of 37 ° C. (Nihon Zeon Co., Ltd. LX407C5) was applied using a bar coater so that the film thickness after drying was 300 nm.
After drying at 140 ° C., a first undercoat layer was formed. (Formation of selective absorption filter layer) Dye (b7) 0.06 was added to 180 g of a 7.4% by weight aqueous solution of low molecular weight gelatin.
6 g and 0.088 g of dye (a6) were added.
And then filtered with a 2 μm polypropylene filter. The obtained coating solution for a selective absorption filter layer was applied onto the first undercoat layer on the side of the selective absorption filter layer using a bar coater so that the dry film thickness was 1.9 μm. After drying for minutes, a selective absorption filter layer was formed.

(Formation of Antireflection Layer) An antireflection layer comprising a polyfunctional acrylic monomer (pentaerythritol tetraacrylate), a photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy Co., Ltd.), and a solvent (MEK.tBuOH) was used. The film thickness after drying is 60 n on the three-layer thin film.
m, dried and then irradiated with ultraviolet rays to cure the antireflection layer, thereby forming an antireflection layer. (Formation of Pressure-Sensitive Adhesive Layer) In the same manner as in Example 1, a protective film and a pressure-sensitive adhesive layer were added to a filter having a selective absorption filter layer, an anti-reflection layer, and a shielding filter layer having an infrared ray shielding function and an electromagnetic wave shielding function. To form a filter of the present invention.

The filter of the present invention was affixed to a soda lime glass with an adhesive, and the protective film was peeled off to examine the spectral transmittance. The transmittance at 540 nm and 593 nm was found to be maximum, and the transmittance at the absorption maximum was 540 nm. Was 63% and the absorption maximum at 593 nm was 3.2%.
The half width of the absorption maximum is such that the absorption maximum at 593 nm is 25 nm.
Met.

Examples 3 and 4 (1) (Preparation of antireflection film) In the same manner as in Example 1, a first undercoat layer, a second undercoat layer, and a hard coat were formed on one side of a 175 μm-thick polyethylene terephthalate film. A layer and an antireflection layer were applied in this order, a protective film was laminated thereon, and an antireflection film provided with an adhesive layer on the opposite surface was prepared.

(2) (Formation of Electromagnetic Wave and Infrared Shielding Layer) A three-layer thin film of ZnO / Ag / ZnO was provided by sputtering on the surface of a 3.5 mm thick soda lime glass. The surface resistance of the three-layer thin film system was 2 Ω / square cm, and the infrared transmittance at 800 nm or more was 20% or less.

(3) (Preparation of Front Plate) The filter of the present invention prepared in Example 1 was attached to one surface of the blue plate glass having the electromagnetic wave and infrared ray shielding layer prepared in (2), and ( The antireflection film of 1) was attached to prepare a front panel for PDP. (Example 3)

The filter of the present invention prepared in Example 2 is adhered to one surface of the soda lime glass having an electromagnetic wave and infrared ray shielding layer produced in (2), and the antireflection film of (1) is adhered to the other surface. Thus, a front panel for a PDP was manufactured. (Example 4)

(4) (Evaluation of filter function) Plasma display panel (PDS4202J-H,
The front plate manufactured by Fujitsu Ltd. was removed, and the front plate prepared in (3) was attached to the main body so that the selective absorption filter layer faced the image display surface of the plasma display panel, thereby producing PDPs 1 and 2. Further, PDP3 in which the filter of the present invention of Example 2 was directly adhered to the PDP body was also manufactured, and its performance was evaluated. The electromagnetic wave and infrared shielding layer were connected to the metal ground on the back of the plasma display panel, and the voltage induced by the electromagnetic wave radiated from the plasma display panel was conducted to the ground to evaluate the function. As evaluation items, measurement of electromagnetic wave and infrared shielding ability, contrast of a displayed image, and evaluation of color reproducibility by visual observation were performed. The electromagnetic wave shielding function is P
In any of DP1 to 3, the frequency is 10 MHz to 2
A minimum of 9 dB or more was obtained in the range of 00 MHz, and the external leakage level of electromagnetic waves regulated by information processing devices and the like was achieved. In addition, the shielding function in the infrared region can be evaluated based on the low transmittance, and about 8% at 800 nm and 3% at 850 nm.
As shown below, it was possible to prevent interference with the infrared remote control device installed in the vicinity. Contrast and visual color reproducibility were significantly improved in all of Examples 1 to 3. The contrast was 10: 1 before the front plate was replaced, but was 15: 1 in each of the examples. Before replacing the front panel, it was confirmed that red with orange was improved to pure red, greenish blue to vivid blue, and yellowish white to pure white.

[0065]

As described above, according to the present invention, the color reproducibility and contrast of an image can be improved only by sticking to an image display device such as a PDP or a front panel, and harmful electromagnetic waves and infrared rays emitted can be reduced. A low-cost image display device filter that can be cut can be provided.

Claims (8)

[Claims] 1. A transparent support having a selective absorption filter layer containing a dye and a polymer binder on at least one side of the transparent support, and having a selective filter layer on only one side, the uppermost layer on the opposite side to the selective filter layer has two sides. Wherein an anti-reflection layer is provided on the uppermost layer on one side and an adhesive layer is provided on the side opposite to the anti-reflection layer. 2. The filter for an image display device according to claim 1, wherein said selective absorption filter layer is provided on a side provided with an adhesive layer. 3. The image display according to claim 1, further comprising a shielding filter layer having at least one of an infrared shielding function and an electromagnetic wave shielding function on at least one side of the transparent support. Equipment filter. 4. The apparatus according to claim 1, further comprising a shielding filter layer having one or both of an infrared shielding function and an electromagnetic wave shielding function on the side where the antireflection layer is provided.
4. The filter for an image display device according to any one of items 1 to 3. 5. The method according to claim 1, wherein the selective absorption filter layer has a wavelength of 560 nm.
The filter for an image display device according to any one of claims 1 to 4, wherein the filter has an absorption maximum having a transmittance of 0.01 to 80% in a range from 1 to 620 nm. 6. The method according to claim 1, wherein the selective absorption filter layer has a thickness of 500 nm.
6. A maximum absorption having a transmittance of 20 to 85% in a range of from 550 to 550 nm and an absorption maximum of 0.01 to 80% in a range of from 560 to 620 nm. 3. The filter for an image display device according to item 1. 7. A front plate for a plasma display panel, wherein the filter according to claim 1 is used. 8. A plasma display panel using the front plate according to claim 7.